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[Ecrit] [Technical Errata Reported] RFC8147 (7752)

RFC Errata System <rfc-editor@rfc-editor.org> Tue, 09 January 2024 15:13 UTC

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Subject: [Ecrit] [Technical Errata Reported] RFC8147 (7752)
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The following errata report has been submitted for RFC8147,
"Next-Generation Pan-European eCall".

--------------------------------------
You may review the report below and at:
https://www.rfc-editor.org/errata/eid7752

--------------------------------------
Type: Technical
Reported by: Andreas Wehrmann <andreas.wehrmann@strabag.com>

Section: 13

Original Text
-------------
<?xml version="1.0"?>
<xs:schema
    targetNamespace="urn:ietf:params:xml:ns:EmergencyCallData:control"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    xmlns:pi="urn:ietf:params:xml:ns:EmergencyCallData:control"
    xmlns:xml="http://www.w3.org/XML/1998/namespace"
    elementFormDefault="qualified"
    attributeFormDefault="unqualified">
    
    <xs:import namespace="http://www.w3.org/XML/1998/namespace"/>
    
    <xs:element name="EmergencyCallData.Control"
        type="pi:controlType"/>
    
    <xs:complexType name="controlType">
        <xs:complexContent>
            <xs:restriction base="xs:anyType">
                <xs:choice>
                    <xs:element name="capabilities"
                        type="pi:capabilitiesType"/>
                    <xs:element name="request" type="pi:requestType"/>
                    <xs:element name="ack" type="pi:ackType"/>
                    <xs:any namespace="##any" processContents="lax"
                        minOccurs="0"
                        maxOccurs="unbounded"/>
                </xs:choice>
                <xs:anyAttribute/>
            </xs:restriction>
        </xs:complexContent>
    </xs:complexType>
    
    <xs:complexType name="ackType">
        <xs:complexContent>
            <xs:restriction base="xs:anyType">
                <xs:sequence minOccurs="1" maxOccurs="unbounded">
                    <xs:element name="actionResult" minOccurs="0"
                        maxOccurs="unbounded">
                        <xs:complexType>
                            <xs:attribute name="action"
                                type="xs:token"
                                use="required"/>
                            <xs:attribute name="success"
                                type="xs:boolean"
                                use="required"/>
                            <xs:attribute name="reason"
                                type="xs:token">
                                <xs:annotation>
                                    <xs:documentation>
                                        conditionally mandatory
                                        when @success="false"
                                        to indicate reason code
                                        for a failure
                                    </xs:documentation>
                                </xs:annotation>
                            </xs:attribute>
                            <xs:attribute name="details"
                                type="xs:string"/>
                            <xs:anyAttribute
                                processContents="skip"/>
                        </xs:complexType>
                    </xs:element>
                    <xs:any namespace="##any" processContents="lax"
                        minOccurs="0"
                        maxOccurs="unbounded"/>
                </xs:sequence>
                <xs:attribute name="ref"
                    type="xs:anyURI"
                    use="required"/>
                
                <xs:attribute name="received"
                    type="xs:boolean"/>
                <xs:anyAttribute/>
            </xs:restriction>
        </xs:complexContent>
    </xs:complexType>
    
    <xs:complexType name="capabilitiesType">
        <xs:complexContent>
            <xs:restriction base="xs:anyType">
                <xs:sequence minOccurs="1" maxOccurs="unbounded">
                    <xs:element name="request"
                        type="pi:requestType"
                        minOccurs="1"
                        maxOccurs="unbounded"/>
                    <xs:any namespace="##any" processContents="lax"
                        minOccurs="0"
                        maxOccurs="unbounded"/>
                </xs:sequence>
                <xs:anyAttribute/>
            </xs:restriction>
        </xs:complexContent>
    </xs:complexType>
    
    <xs:complexType name="requestType">
        <xs:complexContent>
            <xs:restriction base="xs:anyType">
                <xs:choice minOccurs="1" maxOccurs="unbounded">
                    <xs:element name="text" minOccurs="0"
                        maxOccurs="unbounded">
                        <xs:complexType>
                            <xs:simpleContent>
                                <xs:extension base="xs:string">
                                    <xs:anyAttribute
                                        namespace="##any"
                                        processContents="skip"/>
                                </xs:extension>
                            </xs:simpleContent>
                        </xs:complexType>
                    </xs:element>
                    <xs:any namespace="##any" processContents="lax"
                        minOccurs="0"
                        maxOccurs="unbounded"/>
                </xs:choice>
                <xs:attribute name="action" type="xs:token"
                    use="required"/>
                
                <xs:attribute name="int-id" type="xs:unsignedInt"/>
                <xs:attribute name="persistence"
                    type="xs:duration"/>
                <xs:attribute name="datatype" type="xs:token"/>
                <xs:attribute name="supported-values"
                    type="xs:string"/>
                <xs:attribute name="element-id" type="xs:token"/>
                <xs:attribute name="requested-state"
                    type="xs:token"/>
                <xs:anyAttribute/>
            </xs:restriction>
        </xs:complexContent>
    </xs:complexType>
</xs:schema>

Corrected Text
--------------
<?xml version="1.0"?>
<xs:schema
    targetNamespace="urn:ietf:params:xml:ns:EmergencyCallData:control"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    xmlns:pi="urn:ietf:params:xml:ns:EmergencyCallData:control"
    xmlns:xml="http://www.w3.org/XML/1998/namespace"
    elementFormDefault="qualified"
    attributeFormDefault="unqualified">
    
    <xs:import namespace="http://www.w3.org/XML/1998/namespace"/>
    
    <xs:element name="EmergencyCallData.Control"
        type="pi:controlType"/>
    
    <xs:complexType name="controlType">
        <xs:complexContent>
            <xs:restriction base="xs:anyType">
                <xs:choice>
                    <xs:element name="capabilities"
                        type="pi:capabilitiesType"/>
                    <xs:element name="request" type="pi:requestType"/>
                    <xs:element name="ack" type="pi:ackType"/>
                    <xs:any namespace="##other" processContents="lax"
                        minOccurs="0"
                        maxOccurs="unbounded"/>
                </xs:choice>
                <xs:anyAttribute/>
            </xs:restriction>
        </xs:complexContent>
    </xs:complexType>
    
    <xs:complexType name="ackType">
        <xs:complexContent>
            <xs:restriction base="xs:anyType">
                <xs:sequence minOccurs="1" maxOccurs="unbounded">
                    <xs:element name="actionResult" minOccurs="0"
                        maxOccurs="unbounded">
                        <xs:complexType>
                            <xs:attribute name="action"
                                type="xs:token"
                                use="required"/>
                            <xs:attribute name="success"
                                type="xs:boolean"
                                use="required"/>
                            <xs:attribute name="reason"
                                type="xs:token">
                                <xs:annotation>
                                    <xs:documentation>
                                        conditionally mandatory
                                        when @success="false"
                                        to indicate reason code
                                        for a failure
                                    </xs:documentation>
                                </xs:annotation>
                            </xs:attribute>
                            <xs:attribute name="details"
                                type="xs:string"/>
                            <xs:anyAttribute
                                processContents="skip"/>
                        </xs:complexType>
                    </xs:element>
                    <xs:any namespace="##other" processContents="lax"
                        minOccurs="0"
                        maxOccurs="unbounded"/>
                </xs:sequence>
                <xs:attribute name="ref"
                    type="xs:anyURI"
                    use="required"/>
                
                <xs:attribute name="received"
                    type="xs:boolean"/>
                <xs:anyAttribute/>
            </xs:restriction>
        </xs:complexContent>
    </xs:complexType>
    
    <xs:complexType name="capabilitiesType">
        <xs:complexContent>
            <xs:restriction base="xs:anyType">
                <xs:sequence minOccurs="1" maxOccurs="unbounded">
                    <xs:element name="request"
                        type="pi:requestType"
                        minOccurs="1"
                        maxOccurs="unbounded"/>
                    <xs:any namespace="##other" processContents="lax"
                        minOccurs="0"
                        maxOccurs="unbounded"/>
                </xs:sequence>
                <xs:anyAttribute/>
            </xs:restriction>
        </xs:complexContent>
    </xs:complexType>
    
    <xs:complexType name="requestType">
        <xs:complexContent>
            <xs:restriction base="xs:anyType">
                <xs:choice minOccurs="1" maxOccurs="unbounded">
                    <xs:element name="text" minOccurs="0"
                        maxOccurs="unbounded">
                        <xs:complexType>
                            <xs:simpleContent>
                                <xs:extension base="xs:string">
                                    <xs:anyAttribute
                                        namespace="##any"
                                        processContents="skip"/>
                                </xs:extension>
                            </xs:simpleContent>
                        </xs:complexType>
                    </xs:element>
                    <xs:any namespace="##other" processContents="lax"
                        minOccurs="0"
                        maxOccurs="unbounded"/>
                </xs:choice>
                <xs:attribute name="action" type="xs:token"
                    use="required"/>
                
                <xs:attribute name="int-id" type="xs:unsignedInt"/>
                <xs:attribute name="persistence"
                    type="xs:duration"/>
                <xs:attribute name="datatype" type="xs:token"/>
                <xs:attribute name="supported-values"
                    type="xs:string"/>
                <xs:attribute name="element-id" type="xs:token"/>
                <xs:attribute name="requested-state"
                    type="xs:token"/>
                <xs:anyAttribute/>
            </xs:restriction>
        </xs:complexContent>
    </xs:complexType>
</xs:schema>

Notes
-----
The complex types "controlType", "ackType", "capabilitiesType" and "requestType" define extension points by using xs:any with namespace ##any. This violates the "Unique Particle Attribution" rule for XSD 1.0 (see: https://www.w3.org/wiki/UniqueParticleAttribution) and shows up as an error in some tools.
I suggest changing the namespace to ##other like it's done in other schemas (for example, RFC7865 defines extension points in this way: https://datatracker.ietf.org/doc/html/rfc7865#section-9 ).

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-------------
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--------------------------------------
RFC8147 (draft-ietf-ecrit-ecall-27)
--------------------------------------
Title               : Next-Generation Pan-European eCall
Publication Date    : May 2017
Author(s)           : R. Gellens, H. Tschofenig
Category            : PROPOSED STANDARD
Source              : Emergency Context Resolution with Internet Technologies
Area                : Applications and Real-Time
Stream              : IETF
Verifying Party     : IESG

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